My company had a similar policy. The rate of people leaving went up and up. Eventually a new senior leader go HR to do their maths properly, and the “ranges” for many salaries increased by 30-70%. And everyone got increases to match. We’re still nowhere near the US mega-salaries, but the company is entirely unique, which is good enough for a lot of us.
Don’t let the HN bubble fool you. Most of the 2.7 million developers in the US are making between $80K-$170K in most major cities outside of the west coast.